package com.intexh.quickandroid.widget;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.view.animation.Interpolator;
import android.widget.Scroller;

import java.lang.reflect.Field;

/** 
 * ViewPager 滚动速度设置 
 *  
 * @author lyy 
 * 
 */  
public class ViewPagerScroller extends Scroller {  
    private int mScrollDuration = 2000; // 滑动速度  
  
    /** 
     * 设置速度速度 
     *  
     * @param duration 
     */  
    public void setScrollDuration(int duration) {  
        this.mScrollDuration = duration;  
    }  
  
    public ViewPagerScroller(Context context) {  
        super(context);  
    }  
  
    public ViewPagerScroller(Context context, Interpolator interpolator) {  
        super(context, interpolator);  
    }  
  
    public ViewPagerScroller(Context context, Interpolator interpolator,
                             boolean flywheel) {
        super(context, interpolator, flywheel);  
    }  
  
    @Override  
    public void startScroll(int startX, int startY, int dx, int dy, int duration) {  
        super.startScroll(startX, startY, dx, dy, mScrollDuration);  
    }  
  
    @Override  
    public void startScroll(int startX, int startY, int dx, int dy) {  
        super.startScroll(startX, startY, dx, dy, mScrollDuration);  
    }  
  
    public void initViewPagerScroll(ViewPager viewPager) {
        try {  
            Field mScroller = ViewPager.class.getDeclaredField("mScroller");
            mScroller.setAccessible(true);  
            mScroller.set(viewPager, this);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}  